Numerical simulations of the effects of the level of nitrogen impurities in atmospheric helium Townsend discharge

Abstract

The influence of nitrogen impurities on the atmospheric pressure helium discharge in Townsend mode is investigated based on a 1D fluid model. The level of nitrogen impurities was varied in the range 0.1–10 000 ppm, in which the discharge exhibits three notable discharge modes, namely multipulse Townsend discharge, single-pulse Townsend discharge, and multipulse glow discharge with the increase in the impurity level. It is found that the influence of nitrogen impurities on helium discharge in the Townsend mode is entirely different from that in the glow mode; the discharge characteristics are different under different nitrogen contents. Under 1 ppm nitrogen content, both the breakdown voltage and discharge current remain unchanged. As the N2 content increases, the breakdown voltage still remains unchanged but the discharge current decreases. As the N2 content exceeds 350 ppm, the discharge transits from the Townsend mode into the glow mode, and the breakdown voltage decreases dramatically while the current density increases.

Ab initio investigation of potential energy curves of He2, He2+, and extrapolation by the machine learning method

“…No matter pure helium gas discharge or helium‐oxygen, helium‐air mixture, and so forth gas discharges, it is a common sense that molecular $$$ \mathrm{H}{\mathrm{e}}_2^{+} $$$, $$$ \mathrm{H}{\mathrm{e}}_2 $$$ are compositions in plasmas using the helium gas. They are frequently used in numerical simulations of plasma physics [7–9]. $$$ \mathrm{H}{\mathrm{e}}_2^{+} $$$ and $$$ \mathrm{H}{\mathrm{e}}_2 $$$ play important roles in quenching O 2 and N 2 [10, 11].…”

A Novel Dielectric Barrier Discharge (DBD) Reactor with Streamer and Glow Corona Discharge for Improved Ozone Generation at Atmospheric Pressure

“…The intensity of streamer discharge is very high, and it can convert oxygen into zones, which is also recognized as the working principle of the DBD reactor. Corona discharge and glow discharge are usually used for negative discharge [11][12][13][14][15][16]. Their discharge intensity is lower than that of a streamer.…”